msm: camera: ope: Protect ope hw reset with mutex

In flush or error cases, there is possibility that flush all and
error case can concurrently request for ope reset. This ope reset
process command may execute parallelly and cause list corruption issues.
Add mutex to ope hw before doing the reset.

CRs-Fixed: 2599233
Change-Id: Icd7cb809901a84169ea13d496689904a885b4622
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>